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Message-Id: <20230402151031.531534-2-zahari.doychev@linux.com>
Date: Sun, 2 Apr 2023 17:10:30 +0200
From: Zahari Doychev <zahari.doychev@...ux.com>
To: netdev@...r.kernel.org
Cc: jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, hmehrtens@...linear.com,
aleksander.lobakin@...el.com,
Zahari Doychev <zdoychev@...linear.com>
Subject: [PATCH net-next v2 1/2] net: flower: add support for matching cfm fields
From: Zahari Doychev <zdoychev@...linear.com>
Add support to the tc flower classifier to match based on fields in CFM
information elements like level and opcode.
tc filter add dev ens6 ingress protocol 802.1q \
flower vlan_id 698 vlan_ethtype 0x8902 cfm mdl 5 op 46 \
action drop
Signed-off-by: Zahari Doychev <zdoychev@...linear.com>
---
include/net/flow_dissector.h | 21 +++++++
include/uapi/linux/pkt_cls.h | 9 +++
net/core/flow_dissector.c | 29 ++++++++++
net/sched/cls_flower.c | 108 ++++++++++++++++++++++++++++++++++-
4 files changed, 166 insertions(+), 1 deletion(-)
diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 5ccf52ef8809..e1e7e51db88f 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -297,6 +297,26 @@ struct flow_dissector_key_l2tpv3 {
__be32 session_id;
};
+/**
+ * struct flow_dissector_key_cfm
+ * @mdl_ver: maintenance domain level(mdl) and cfm protocol version
+ * @opcode: code specifying a type of cfm protocol packet
+ *
+ * See 802.1ag, ITU-T G.8013/Y.1731
+ * 1 2
+ * |7 6 5 4 3 2 1 0|7 6 5 4 3 2 1 0|
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | mdl | version | opcode |
+ * +-----+---------+-+-+-+-+-+-+-+-+
+ */
+struct flow_dissector_key_cfm {
+ u8 mdl_ver;
+ u8 opcode;
+};
+
+#define FLOW_DIS_CFM_MDL_MASK 7
+#define FLOW_DIS_CFM_MDL_SHIFT 5
+
enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_CONTROL, /* struct flow_dissector_key_control */
FLOW_DISSECTOR_KEY_BASIC, /* struct flow_dissector_key_basic */
@@ -329,6 +349,7 @@ enum flow_dissector_key_id {
FLOW_DISSECTOR_KEY_NUM_OF_VLANS, /* struct flow_dissector_key_num_of_vlans */
FLOW_DISSECTOR_KEY_PPPOE, /* struct flow_dissector_key_pppoe */
FLOW_DISSECTOR_KEY_L2TPV3, /* struct flow_dissector_key_l2tpv3 */
+ FLOW_DISSECTOR_KEY_CFM, /* struct flow_dissector_key_cfm */
FLOW_DISSECTOR_KEY_MAX,
};
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 648a82f32666..8e3f809c9a03 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -594,6 +594,8 @@ enum {
TCA_FLOWER_KEY_L2TPV3_SID, /* be32 */
+ TCA_FLOWER_KEY_CFM, /* nested */
+
__TCA_FLOWER_MAX,
};
@@ -702,6 +704,13 @@ enum {
TCA_FLOWER_KEY_FLAGS_FRAG_IS_FIRST = (1 << 1),
};
+enum {
+ TCA_FLOWER_KEY_CFM_OPT_UNSPEC,
+ TCA_FLOWER_KEY_CFM_MD_LEVEL,
+ TCA_FLOWER_KEY_CFM_OPCODE,
+ TCA_FLOWER_KEY_CFM_OPT_MAX,
+};
+
#define TCA_FLOWER_MASK_FLAGS_RANGE (1 << 0) /* Range-based match */
/* Match-all classifier */
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 25fb0bbc310f..7c694e7b9917 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -547,6 +547,29 @@ __skb_flow_dissect_arp(const struct sk_buff *skb,
return FLOW_DISSECT_RET_OUT_GOOD;
}
+static enum flow_dissect_ret
+__skb_flow_dissect_cfm(const struct sk_buff *skb,
+ struct flow_dissector *flow_dissector,
+ void *target_container, const void *data,
+ int nhoff, int hlen)
+{
+ struct flow_dissector_key_cfm *key, *hdr, _hdr;
+
+ if (!dissector_uses_key(flow_dissector, FLOW_DISSECTOR_KEY_CFM))
+ return FLOW_DISSECT_RET_OUT_GOOD;
+
+ hdr = __skb_header_pointer(skb, nhoff, sizeof(*key), data, hlen, &_hdr);
+ if (!hdr)
+ return FLOW_DISSECT_RET_OUT_BAD;
+
+ key = skb_flow_dissector_target(flow_dissector, FLOW_DISSECTOR_KEY_CFM,
+ target_container);
+
+ *key = *hdr;
+
+ return FLOW_DISSECT_RET_OUT_GOOD;
+}
+
static enum flow_dissect_ret
__skb_flow_dissect_gre(const struct sk_buff *skb,
struct flow_dissector_key_control *key_control,
@@ -1390,6 +1413,12 @@ bool __skb_flow_dissect(const struct net *net,
break;
}
+ case htons(ETH_P_CFM): {
+ fdret = __skb_flow_dissect_cfm(skb, flow_dissector,
+ target_container, data,
+ nhoff, hlen);
+ break;
+ }
default:
fdret = FLOW_DISSECT_RET_OUT_BAD;
break;
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 885c95191ccf..75f3a64f0daa 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -71,6 +71,7 @@ struct fl_flow_key {
struct flow_dissector_key_num_of_vlans num_of_vlans;
struct flow_dissector_key_pppoe pppoe;
struct flow_dissector_key_l2tpv3 l2tpv3;
+ struct flow_dissector_key_cfm cfm;
} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
struct fl_flow_mask_range {
@@ -711,7 +712,7 @@ static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
[TCA_FLOWER_KEY_PPPOE_SID] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_PPP_PROTO] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_L2TPV3_SID] = { .type = NLA_U32 },
-
+ [TCA_FLOWER_KEY_CFM] = { .type = NLA_NESTED },
};
static const struct nla_policy
@@ -760,6 +761,11 @@ mpls_stack_entry_policy[TCA_FLOWER_KEY_MPLS_OPT_LSE_MAX + 1] = {
[TCA_FLOWER_KEY_MPLS_OPT_LSE_LABEL] = { .type = NLA_U32 },
};
+static const struct nla_policy cfm_opt_policy[TCA_FLOWER_KEY_CFM_OPT_MAX] = {
+ [TCA_FLOWER_KEY_CFM_MD_LEVEL] = { .type = NLA_U8 },
+ [TCA_FLOWER_KEY_CFM_OPCODE] = { .type = NLA_U8 },
+};
+
static void fl_set_key_val(struct nlattr **tb,
void *val, int val_type,
void *mask, int mask_type, int len)
@@ -1644,6 +1650,60 @@ static bool is_vlan_key(struct nlattr *tb, __be16 *ethertype,
return false;
}
+static int fl_set_key_cfm_md_level(struct nlattr **tb,
+ struct fl_flow_key *key,
+ struct fl_flow_key *mask,
+ struct netlink_ext_ack *extack)
+{
+ u8 level;
+
+ if (!tb[TCA_FLOWER_KEY_CFM_MD_LEVEL])
+ return 0;
+
+ level = nla_get_u8(tb[TCA_FLOWER_KEY_CFM_MD_LEVEL]);
+ if (level & ~FLOW_DIS_CFM_MDL_MASK) {
+ NL_SET_ERR_MSG_ATTR(extack, tb[TCA_FLOWER_KEY_CFM_MD_LEVEL],
+ "cfm md level must be 0-7");
+ return -EINVAL;
+ }
+
+ key->cfm.mdl_ver = level << FLOW_DIS_CFM_MDL_SHIFT;
+ mask->cfm.mdl_ver = FLOW_DIS_CFM_MDL_MASK << FLOW_DIS_CFM_MDL_SHIFT;
+
+ return 0;
+}
+
+static void fl_set_key_cfm_opcode(struct nlattr **tb,
+ struct fl_flow_key *key,
+ struct fl_flow_key *mask,
+ struct netlink_ext_ack *extack)
+{
+ fl_set_key_val(tb, &key->cfm.opcode, TCA_FLOWER_KEY_CFM_OPCODE,
+ &mask->cfm.opcode, TCA_FLOWER_UNSPEC,
+ sizeof(key->cfm.opcode));
+}
+
+static int fl_set_key_cfm(struct nlattr **tb,
+ struct fl_flow_key *key,
+ struct fl_flow_key *mask,
+ struct netlink_ext_ack *extack)
+{
+ struct nlattr *nla_cfm_opt[TCA_FLOWER_KEY_CFM_OPT_MAX];
+ int err;
+
+ if (!tb[TCA_FLOWER_KEY_CFM])
+ return 0;
+
+ err = nla_parse_nested(nla_cfm_opt, TCA_FLOWER_KEY_CFM_OPT_MAX,
+ tb[TCA_FLOWER_KEY_CFM], cfm_opt_policy, extack);
+ if (err < 0)
+ return err;
+
+ fl_set_key_cfm_opcode(nla_cfm_opt, key, mask, extack);
+
+ return fl_set_key_cfm_md_level(nla_cfm_opt, key, mask, extack);
+}
+
static int fl_set_key(struct net *net, struct nlattr **tb,
struct fl_flow_key *key, struct fl_flow_key *mask,
struct netlink_ext_ack *extack)
@@ -1794,6 +1854,10 @@ static int fl_set_key(struct net *net, struct nlattr **tb,
TCA_FLOWER_KEY_L2TPV3_SID,
&mask->l2tpv3.session_id, TCA_FLOWER_UNSPEC,
sizeof(key->l2tpv3.session_id));
+ } else if (key->basic.n_proto == htons(ETH_P_CFM)) {
+ ret = fl_set_key_cfm(tb, key, mask, extack);
+ if (ret)
+ return ret;
}
if (key->basic.ip_proto == IPPROTO_TCP ||
@@ -1976,6 +2040,8 @@ static void fl_init_dissector(struct flow_dissector *dissector,
FLOW_DISSECTOR_KEY_PPPOE, pppoe);
FL_KEY_SET_IF_MASKED(mask, keys, cnt,
FLOW_DISSECTOR_KEY_L2TPV3, l2tpv3);
+ FL_KEY_SET_IF_MASKED(mask, keys, cnt,
+ FLOW_DISSECTOR_KEY_CFM, cfm);
skb_flow_dissector_init(dissector, keys, cnt);
}
@@ -2984,6 +3050,43 @@ static int fl_dump_key_ct(struct sk_buff *skb,
return -EMSGSIZE;
}
+static int fl_dump_key_cfm(struct sk_buff *skb,
+ struct fl_flow_key *key,
+ struct fl_flow_key *mask)
+{
+ struct nlattr *opts;
+ int err;
+
+ if (!memchr_inv(&mask->cfm, 0, sizeof(mask->cfm)))
+ return 0;
+
+ opts = nla_nest_start(skb, TCA_FLOWER_KEY_CFM);
+ if (!opts)
+ return -EMSGSIZE;
+
+ if (mask->cfm.mdl_ver) {
+ err = nla_put_u8(skb, TCA_FLOWER_KEY_CFM_MD_LEVEL,
+ key->cfm.mdl_ver >> FLOW_DIS_CFM_MDL_SHIFT);
+ if (err)
+ goto err_cfm_opts;
+ }
+
+ if (mask->cfm.opcode) {
+ err = nla_put_u8(skb, TCA_FLOWER_KEY_CFM_OPCODE,
+ key->cfm.opcode);
+ if (err)
+ goto err_cfm_opts;
+ }
+
+ nla_nest_end(skb, opts);
+
+ return 0;
+
+err_cfm_opts:
+ nla_nest_cancel(skb, opts);
+ return err;
+}
+
static int fl_dump_key_options(struct sk_buff *skb, int enc_opt_type,
struct flow_dissector_key_enc_opts *enc_opts)
{
@@ -3266,6 +3369,9 @@ static int fl_dump_key(struct sk_buff *skb, struct net *net,
sizeof(key->hash.hash)))
goto nla_put_failure;
+ if (fl_dump_key_cfm(skb, key, mask))
+ goto nla_put_failure;
+
return 0;
nla_put_failure:
--
2.40.0
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